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Issues: Updates few CEL expressions to Expr #58

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merged 6 commits into from
Jan 10, 2024
Merged

Issues: Updates few CEL expressions to Expr #58

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55cbf11
Issue 36: Update Disallow HostPorts expression to use not logical ope…
athegaul Jan 10, 2024
92b911e
Issue 38: Update CEL expression to Expr for Require non-root containers
athegaul Jan 10, 2024
caff338
Issue 39: Update CEL expression to Expr for Drop ALL capabilities
athegaul Jan 10, 2024
b12ae84
Issue 40: Update CEL expression to Expr for Semantic version check fo…
athegaul Jan 10, 2024
b75466d
Issue 42: Update CEL expression to Expr for Optional
athegaul Jan 10, 2024
f9cbb29
Issue 46: Update CEL expression to Expr for Custom Metrics
athegaul Jan 10, 2024
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88 changes: 35 additions & 53 deletions examples.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -81,10 +81,10 @@ examples:

all(object.spec.template.spec.containers, {
let container = #;
!("ports" in keys(container)) ||
"ports" not in container ||
all(container.ports, {
let port = #;
!("hostPort" in keys(port)) ||
"hostPort" not in port ||
port.hostPort == 0
})
})
Expand Down Expand Up @@ -114,28 +114,21 @@ examples:

- name: "Require non-root containers"
expr: |
// Needs Expr translation from CEL. Contributions welcome!
// https://github.com/polds/expr-playground/issues/38
//
// According the Pod Security Standards, Containers must be required to run as non-root users.
// https://kubernetes.io/docs/concepts/security/pod-security-standards/#restricted

// Pod or Containers must set `securityContext.runAsNonRoot`
(
(has(object.spec.template.spec.securityContext) && has(object.spec.template.spec.securityContext.runAsNonRoot)) ||
object.spec.template.spec.containers.all(container,
has(container.securityContext) && has(container.securityContext.runAsNonRoot)
)
("securityContext" in object.spec.template.spec && "runAsNonRoot" in object.spec.template.spec.securityContext) ||
all(object.spec.template.spec.containers, { "securityContext" in # && "runAsNonRoot" in #.securityContext })
)
&&

// Neither Pod nor Containers should set `securityContext.runAsNonRoot` to false
(
(!has(object.spec.template.spec.securityContext) || !has(object.spec.template.spec.securityContext.runAsNonRoot) || object.spec.template.spec.securityContext.runAsNonRoot != false)
&&
object.spec.template.spec.containers.all(container,
!has(container.securityContext) || !has(container.securityContext.runAsNonRoot) || container.securityContext.runAsNonRoot != false
)
("securityContext" not in object.spec.template.spec || "runAsNonRoot" not in object.spec.template.spec.securityContext || object.spec.template.spec.securityContext.runAsNonRoot != false)
&&
all(object.spec.template.spec.containers, { "securityContext" not in # || "runAsNonRoot" not in #.securityContext || #.securityContext.runAsNonRoot != false })
)
data: |
object:
Expand Down Expand Up @@ -164,28 +157,29 @@ examples:

- name: "Drop ALL capabilities"
expr: |
// Needs Expr translation from CEL. Contributions welcome!
// https://github.com/polds/expr-playground/issues/39
//
// According the Pod Security Standards, Containers must drop `ALL` capabilities, and are only permitted to add back the `NET_BIND_SERVICE` capability.
// https://kubernetes.io/docs/concepts/security/pod-security-standards/#restricted

// Containers must drop `ALL` capabilities,
object.spec.template.spec.containers.all(container,
has(container.securityContext) &&
has(container.securityContext.capabilities) &&
has(container.securityContext.capabilities.drop) &&
size(container.securityContext.capabilities.drop) >= 1 &&
container.securityContext.capabilities.drop.exists(c, c == 'ALL')
)
all(object.spec.template.spec.containers, {
let container = #;

"securityContext" in container &&
"capabilities" in container.securityContext &&
"drop" in container.securityContext.capabilities &&
len(container.securityContext.capabilities.drop) >= 1 &&
any(container.securityContext.capabilities.drop, # == 'ALL')
})
&&
// and are only permitted to add back the `NET_BIND_SERVICE` capability
object.spec.template.spec.containers.all(container,
!has(container.securityContext) ||
!has(container.securityContext.capabilities) ||
!has(container.securityContext.capabilities.add) ||
container.securityContext.capabilities.add.all(cap, cap in params.allowedCapabilities)
)
all(object.spec.template.spec.containers, {
let container = #;

"securityContext" not in container ||
"capabilities" not in container.securityContext ||
"add" not in container.securityContext.capabilities ||
all(container.securityContext.capabilities.add, # in params.allowedCapabilities)
})
data: |
params:
allowedCapabilities: [NET_BIND_SERVICE]
Expand Down Expand Up @@ -215,19 +209,17 @@ examples:

- name: "Semantic version check for image tags (Regex)"
expr: |
// Needs Expr translation from CEL. Contributions welcome!
// https://github.com/polds/expr-playground/issues/40
//
// Checks if the container images are tagged following the semantic version.

object.spec.containers.all(container,
container.image.contains("@sha256") || // allow digest
container.image.lastIndexOf(":") > -1 &&
container.image.substring(container.image.lastIndexOf(":") + 1)
.matches('^v?(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(?:-((?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\\+([0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*))?$')
// the regex above is suggested by semver.org: https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
// allowing the "v" prefix
)
all(object.spec.containers, {
let container = #;

container.image contains "@sha256" ||
lastIndexOf(container.image, ":") > -1 &&
container.image[lastIndexOf(container.image, ":") + 1:] matches '^v?(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(?:-((?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\\+([0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*))?$'
// the regex above is suggested by semver.org: https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
// allowing the "v" prefix
})
data: |
object:
apiVersion: v1
Expand Down Expand Up @@ -304,11 +296,7 @@ examples:

- name: "Optional"
expr: |
// Needs Expr translation from CEL. Contributions welcome!
// https://github.com/polds/expr-playground/issues/42
//

object.?foo.orValue("fallback")'
object?.foo ?? "fallback"
data: "object: {}"
category: "General"

Expand Down Expand Up @@ -344,9 +332,6 @@ examples:

- name: "Access Log Filtering"
expr: |
// Needs Expr translation from CEL. Contributions welcome!
// https://github.com/polds/expr-playground/issues/45
//
// Use CEL to filter access logs in Istio by response code or target cluster.
// https://istio.io/latest/docs/tasks/observability/logs/telemetry-api/#get-started-with-telemetry-api
//
Expand Down Expand Up @@ -412,9 +397,6 @@ examples:

- name: "Custom Metrics"
expr: |
// Needs Expr translation from CEL. Contributions welcome!
// https://github.com/polds/expr-playground/issues/46
//
// Use CEL to customize the metrics that Istio generates
// https://istio.io/latest/docs/tasks/observability/metrics/customize-metrics/#use-expressions-for-values
//
Expand All @@ -435,7 +417,7 @@ examples:
// request_host:
// value: "request.host" # <--- CEL

has(request.host) ? request.host : "unknown"
"host" in request ? request.host : "unknown"
data: |
request:
duration: "4.144461ms"
Expand Down